Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1618181 | Journal of Alloys and Compounds | 2010 | 5 Pages |
Abstract
The microwave dielectric properties and the microstructures of (1 â x)Mg0.95Co0.05TiO3-xCa0.6La0.8/3TiO3 ceramic system, prepared by a mixed oxide route, have been investigated. The sintered 0.9Mg0.95Co0.05TiO3-0.1Ca0.6La0.8/3TiO3 ceramics with B2O3 addition were characterized using X-ray diffraction spectra and scanning electron microscopy (SEM). The microwave dielectric properties are found to strongly correlate with the sintering temperature as well as the amount of B2O3 addition. The Q Ã f value of 0.9Mg0.95Co0.05TiO3-0.1Ca0.6La0.8/3TiO3 ceramic increased with increasing temperature to 1225 °C/4 h and decreased thereafter. The decrease in Q Ã f value was coincident with the abnormal grain growth. A maximum Q Ã f value of 76,000 GHz associated with an dielectric constant (Ér) of 22.67 and a temperature coefficient (Ïf) of â12 ppm/°C, was achieved for samples with 0.5 wt.% B2O3 additions sintering at 1225 °C/4 h. By appropriately adjusting the x value in the (1 â x)Mg0.95Co0.05TiO3-xCa0.6La0.8/3TiO3 ceramic system, zero Ïf value can be obtained. A parallel-coupled line band-pass filter is designed and simulated using the proposed dielectric to study its performance.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Chun-Hsu Shen, Cheng-Liang Huang, Ling-Mei Lin, Chung-Long Pan,